The situation in 2008 was managed in a very disciplined way. The 2020 campaign was a disorganized ballsup.
In 2008 Obama and Clinton had about the same number of delegates going into the convention and Clinton had more of the DC power blocks behind her but she made too many enemies so the super delegates and the money raisers supported Obama as the best canodate to win. Clinton had very high negatives in all key swing demographics. Obama didnt.
In Jan 2020 there were no serious Dem candidates because Trump looked like a shoo in for reelection. It takes a good 12 to 18 month of ground work in key states to be in good position to start an election nomination year. There were a bunch of party heavy weight who decided to sit out 2020 to wait for 2024. Then COVID happened and the party saw a way of gaming the system so they had a chance. But all the people who had announced were hopeless losers. Thats when Biden was drafted. He had no base. He had no serious power blocks behind him. He was a very weak candidate. But he was the only candidate available who was not hopeless. As was proved in the day. He actually turned in a very weak performance but the political fixers took care of enough keys states and caused enough confusion afterwards to swing it.
The problem was because he was drafted there was no solid party base behind him and the only base he had in DC was the Not Trump people. As a result he was a loose cannon from the start. They tried to put in their own White House Chief of Staff who could have brought some sanity and pragmatism to the WH but Biden put in some Yes Man political nonentity. Which has been repeated through the Administration.
The last time the Dem party power brokers lost control of the White House was with Wilson in 1912. And for pretty much the same reason. The power brokers never expected to win and only won because of a vote split. So the Wilson administration careered from one train wreck to another all the way into World War 1. And then created the set up for World War 2.
Biden before he was senile was stubborn, vindictive, cunning and stupid. So not the sort of person the senior party people could talk sense into. This is one occasion where an Obama quote sums the current situation. Never underestimate Bidens ability to fuck things up.
Which is exactly what he is doing.